JP2914807B2 - Light receiving sensor for distance measurement - Google Patents
Light receiving sensor for distance measurementInfo
- Publication number
- JP2914807B2 JP2914807B2 JP4005639A JP563992A JP2914807B2 JP 2914807 B2 JP2914807 B2 JP 2914807B2 JP 4005639 A JP4005639 A JP 4005639A JP 563992 A JP563992 A JP 563992A JP 2914807 B2 JP2914807 B2 JP 2914807B2
- Authority
- JP
- Japan
- Prior art keywords
- light receiving
- receiving sensor
- light
- sensor
- distance measurement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/02—Details
- G01C3/06—Use of electric means to obtain final indication
- G01C3/08—Use of electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
Description
【０００１】[0001]
【産業上の利用分野】本発明は受光センサー、特に複数
の測距エリアを持つ測距用受光センサーに関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light receiving sensor, and more particularly to a light receiving sensor for distance measurement having a plurality of distance measuring areas.
【０００２】[0002]
【従来の技術】最近測距用センサーとして、一つの領域
を複数の受光エリアにて測定する受光センサー（図９）
や、広視野測距の為に複数の領域を複数の受光エリアに
て測定する受光センサー（図１０）等が知られている。2. Description of the Related Art Recently, as a distance measuring sensor, a light receiving sensor that measures one area with a plurality of light receiving areas (FIG. 9)
In addition, a light receiving sensor (FIG. 10) for measuring a plurality of regions with a plurality of light receiving areas for wide-field ranging is known.
【０００３】これらの受光センサーに於いて、外光によ
る電気回路の飽和を防ぐためにぎりぎりの大きさまで小
さくするのが常であった。特に投光手段により被写体に
向けて照射しその反射光を受光して距離を測定する測距
装置に於いては、投光手段であるＩＲＥＤの発光部面積
に相当したセンサー形状にするのが普通であった。[0003] In these light receiving sensors, it has been customary to reduce the size to a very small size in order to prevent saturation of the electric circuit due to external light. In particular, in a distance measuring device that irradiates a subject with a light projecting means and receives reflected light thereof to measure a distance, it is usual to use a sensor shape corresponding to a light emitting area of an IRED as a light projecting means. Met.
【０００４】また、投光手段であるＩＲＥＤは光を集光
するために、ＩＲＥＤの前面にレンズを入れたり、ＩＲ
ＥＤパッケージに半球形のドーム（図７）をつけたりし
ていた。In order to collect light, an IRED as a light projecting means is provided with a lens in front of the IRED or an IRED.
A hemispherical dome (Fig. 7) was attached to the ED package.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
受光センサーの大きさでは、例えば図９の場合には投光
手段であるＩＲＥＤ像との合致をさせるために、センサ
ーＬ４の領域に入るように調整したとすると、測距光学
系のズレ、収差及びチップのマウント精度、センサー位
置ズレ等により、必ずしも合致距離にて合致させたよう
に他のセンサー上にてＩＲＥＤ像が配置されるとはかぎ
らなかった。そのため周辺のセンサーになればなるほど
距離に対するリニアリティが低下し、調整が困難或いは
複雑になったり、調整不可能という事態になったりして
いた。However, according to the size of the conventional light receiving sensor, for example, in the case of FIG. 9, the light receiving sensor is set so as to enter the area of the sensor L4 in order to match with the IRED image as the light projecting means. If it is adjusted, the IRED image will not always be arranged on another sensor as if they were matched at the matching distance due to the displacement of the ranging optical system, aberration, chip mounting accuracy, sensor position misalignment, etc. Did not. For this reason, the linearity with respect to the distance decreases as the number of peripheral sensors increases, and the adjustment becomes difficult or complicated, or the adjustment becomes impossible.
【０００６】また、図１０の場合には広視野測距用ＩＲ
ＥＤを複数もつが、諸々の事情にてＩＲＥＤドーム径が
小さくなると、図８のように収差により左右のＩＲＥＤ
像が変形してくる。特に測距能力を向上させる為には少
しでもＩＲＥＤ像を漏れないようにしなければならない
という要求があるが、そのような収差があるとその分Ｉ
ＲＥＤ像をカバーしきれず測距能力の低下につながっ
た。さらに図１０の構成でも図９の構成と同様に位置ズ
レによる問題も発生した。[0006] In the case of FIG.
Although there are a plurality of EDs, if the diameter of the IRED dome becomes smaller due to various circumstances, as shown in FIG.
The image is deformed. In particular, there is a demand that the IRED image should not leak even a little in order to improve the distance measuring ability.
The RED image could not be covered completely, which led to a reduction in the distance measurement capability. Further, the configuration shown in FIG. 10 also has a problem due to misalignment as in the configuration shown in FIG.
【０００７】[0007]
【課題を解決するための手段及び作用】本発明は、これ
ら従来例の欠点・要望に鑑み、複数の受光エリアを持つ
受光センサーにおいて、中心部分よりも周辺部分の受光
エリアの受光面積を大きくするという構成をとることに
よって、前記従来例の問題点を解決しようとしたもので
ある。SUMMARY OF THE INVENTION In view of the drawbacks and demands of the prior art, the present invention provides a light receiving sensor having a plurality of light receiving areas, in which the light receiving area of the peripheral light receiving area is larger than that of the central part. With this configuration, the problem of the conventional example is solved.
【０００８】つまり本発明の構成をとれば、合致調整に
よる位置ズレにともなうリニアリティの劣化を防止する
と共に、左右の測距能力が著しく低下するということが
なくなる。That is, according to the configuration of the present invention, the linearity is not degraded due to the positional deviation due to the matching adjustment, and the right and left distance measuring capability is not significantly reduced.
【０００９】[0009]
【実施例】図１は本発明による測距用センサーの第１実
施例を示す正面図、図２は図１の受光センサーが受け持
つ測距エリアを示す図である。FIG. 1 is a front view showing a first embodiment of a distance measuring sensor according to the present invention, and FIG. 2 is a diagram showing a distance measuring area covered by a light receiving sensor of FIG.
【００１０】Ｌ1 〜Ｌ6 は図示の如く配列されている受
光センサーで、受光センサーＬ1 は最至近エリアを測定
し、受光センサーＬ2 は至近よりの中間エリア１を測定
し、受光センサーＬ3 は至近よりの中間エリア２を測定
し、受光センサーＬ4 は中間エリア３を測定する。ま
た、受光センサーＬ4 はその中心部分にて投光手段であ
る不図示のＩＲＥＤ像を合致させるように受光レンズの
位置合わせを行う。L 1 to L 6 are light receiving sensors arranged as shown in the drawing, the light receiving sensor L 1 measures the closest area, the light receiving sensor L 2 measures the intermediate area 1 from the closest, and the light receiving sensor L 3 measures the middle area 2 of from near, the light receiving sensor L 4 are measuring the intermediate area 3. The light receiving sensor L 4 are for aligning the light receiving lens so as to match the IRED image (not shown) which is a light projecting means at its central portion.
【００１１】受光センサーＬ5 は無限よりの中間エリア
４を測定し、受光センサーＬ6 は最無限エリアを測定す
る。以上の受光センサーＬ1 〜Ｌ6 は、中間エリア３を
測距する受光センサーＬ4を中心とすると、これより至
近側を測距する受光センサーＬ3 ，Ｌ2 ，Ｌ1 が、夫々
Ｌ1 ＞Ｌ2 ＞Ｌ3 の順番にて基線長方向（センサー上で
至近と無限を結ぶ線を以下基線と称し、その方向を基線
長方向と称す）に大きくしている。[0011] The light-receiving sensor L 5 measures the intermediate area 4 than infinite, the light-receiving sensors L 6 measures the most infinite area. When the light receiving sensors L 1 to L 6 are centered on the light receiving sensor L 4 that measures the distance in the intermediate area 3, the light receiving sensors L 3 , L 2 , and L 1 that measure the distance closer to the center are respectively L 1. > L 2 > L 3 in the order of the base line length direction (the line connecting the nearest and infinity on the sensor is hereinafter referred to as the base line, and the direction is referred to as the base line length direction).
【００１２】また、受光センサーＬ5 ，Ｌ6 は、Ｌ6 ＞
Ｌ5 の順番にて基線長方向に大きくなっている。そし
て、それらの受光センサーは受光センサーＬ4 を中心と
して対称となっている。Further, the light receiving sensors L 5 and L 6 satisfy L 6 >
It is larger in the base length direction in the order of L 5. And their light receiving sensor has a symmetrical around the light-receiving sensor L 4.
【００１３】すなわち、本実施例では図９に示す従来例
のように、各受光センサーの基線長方向の長さが等間隔
ではなく、受光センサーＬ4 を中心として漸時大きくな
るようにしているので、近側及び遠側でのＩＲＥＤ像の
歪みによるリニアリティ不良を改良することができる。
また、基線長方向に対するボケによる影響も緩和され
る。[0013] That is, as in the conventional example shown in FIG. 9 in this embodiment, not the length of the base length direction of the respective light receiving sensors equally spaced, so that lozenge increase around the light-receiving sensor L 4 Therefore, it is possible to improve the linearity defect due to the distortion of the IRED image on the near side and the far side.
In addition, the influence of blurring in the base line length direction is also reduced.
【００１４】図３は本発明による測距用受光センサーの
第２実施例を示す図である。FIG. 3 is a diagram showing a second embodiment of the light receiving sensor for distance measurement according to the present invention.
【００１５】本実施例の測距用受光センサーは、上記し
た第１実施例の場合と基本的には同様であるが、受光セ
ンサーＬ4 に受光レンズのピントを合わせた場合の至近
側および無限側のピントのボケ量に対して改良したもの
である。The distance measuring light receiving sensor of the present embodiment is basically similar to the case of the first embodiment described above, the near side when the focus of the light receiving lens in the light receiving sensor L 4 and infinitely This is an improvement with respect to the amount of defocus of the side focus.
【００１６】つまり、至近側になればなるほど受光レン
ズのピントがボケてくるので、ＩＲＥＤ像が大きくな
り、図９に示す従来例ではカバーしきれなくなり、リニ
アリティおよび測距能力の低下につながる。That is, since the focus of the light-receiving lens becomes more blurred as the distance from the lens becomes closer, the IRED image becomes larger and cannot be completely covered in the conventional example shown in FIG.
【００１７】これに対し、本実施例ではその分基線方向
と垂直な方向における長さを、受光センサーＬ4 からの
距離に応じて大きくすることにより対処している。ま
た、受光センサーＬ4 に対して無限側の測距エリアを持
つ受光センサーについても同様である。[0017] In contrast, the length in correspondingly baseline direction perpendicular to the direction in this embodiment has addressed by increasing with distance from the light receiving sensor L 4. The same applies to the light receiving sensor with distance measurement area of the infinity side with respect to the light receiving sensor L 4.
【００１８】図４は本発明による測距用受光センサーの
第３実施例を示す。FIG. 4 shows a third embodiment of a light receiving sensor for distance measurement according to the present invention.
【００１９】本実施例は、広視野測距用の受光センサー
で、この受光センサーの構成を図５に示すファインダー
との位置関係を参照しながら説明する。This embodiment is a light-receiving sensor for wide-field distance measurement. The structure of this light-receiving sensor will be described with reference to a positional relationship with a finder shown in FIG.
【００２０】本実施例では、不図示の投光素子であるＩ
ＲＥＤは全部で５個点灯するが、その配置は一番左のＩ
ＲＥＤがＬ12エリアと示す部分に向けて照射され、この
エリアに被写体がある場合には、図４に示す受光センサ
ーＬ12にＩＲＥＤ像が結像される。In this embodiment, a light emitting element I (not shown)
The RED lights up in total of five, but the arrangement is the leftmost I
RED is radiated toward the portion shown as L 12 areas, if there is a subject in this area, IRED image is formed on the light-receiving sensor L 12 shown in FIG.
【００２１】同様に、左から２番目のＩＲＥＤは、図５
のファインダー上のＬ10エリアと示す部分に向けて照射
されるが、このエリアに被写体がいた場合には図４に示
される受光センサーＬ10にＩＲＥＤ像が結像される。以
下同様にして、中央のＩＲＥＤはＬ7 ，Ｌ8 ，Ｌ9 上に
結像され、右から２番目のＩＲＥＤはＬ11に、一番右に
あるＩＲＥＤ像はＬ13に結像される。Similarly, the second IRED from the left is shown in FIG.
While it is irradiated towards the the L 10 parts showing the area on the viewfinder, IRED image on the light receiving sensor L 10 is shown in Figure 4 when the subject was in this area is focused. Hereinafter similarly, the center of the IRED is imaged onto L 7, L 8, L 9 , the second is the IRED L 11 from the right, IRED image on the far right is imaged L 13.
【００２２】このような配置を有する広視野測距用受光
センサーは、まずＩＲＥＤと受光センサーとの合致をＬ
8 とＬ9 の受光センサーの切り換え部分にて行い、そこ
で受光レンズのピント合わせを行う。本実施例の構造と
図１０に示す従来例との相違は、基線長方向と垂直な方
向に、Ｌ7 ，Ｌ8 ，Ｌ9 を中心として距離が遠くなれば
なる程、その幅を大きくしている点である。In the light receiving sensor for wide-field distance measurement having such an arrangement, first, the matching between the IRED and the light receiving sensor is determined by L.
Performed at 8 and switching portions of the light receiving sensor L 9, where to focus the light receiving lens. The difference between the structure of the present embodiment and the conventional example shown in FIG. 10 is that, as the distance becomes longer in the direction perpendicular to the base line length direction around L 7 , L 8 , L 9 , the width becomes larger. That is the point.
【００２３】すなわち、センサーＬ10はＬ7 よりも幅が
大きく、Ｌ12の幅はＬ10の幅よりも大きくなっており、
Ｌ11，Ｌ13も同様である。[0023] In other words, the sensor L 10 is greater width than L 7, the width of the L 12 is larger than the width of the L 10,
The same applies to L 11 and L 13 .
【００２４】これは図８の従来例で説明したように、中
心部はほぼ設計値どおりの倍率にて受光センサー上に結
像されるが、周辺部は設計値に対して周辺側にずれてし
まうのをカバーすることができ、測距能力の向上に役立
っている。As described in the conventional example of FIG. 8, an image is formed on the light receiving sensor at the center at a magnification substantially equal to the designed value, but the peripheral portion is shifted to the peripheral side with respect to the designed value. It can cover the situation and helps to improve the distance measurement ability.
【００２５】図６は本発明による測距用受光センサーの
第４実施例を示している。FIG. 6 shows a fourth embodiment of the light receiving sensor for distance measurement according to the present invention.
【００２６】本実施例は図４に示す実施例と同様に広視
野測距用受光センサーで、各受光センサーの構成は図４
の場合と基本的には同様の構成である。This embodiment is similar to the embodiment shown in FIG. 4 and is a light receiving sensor for wide-field distance measurement.
The configuration is basically the same as in the case of.
【００２７】本実施例は、図４に示す第２実施例に対
し、さらに基線長方向に、Ｌ8 ，Ｌ9の境界を中心に、
周辺にいくにつれてその幅を大きくしている。This embodiment is different from the second embodiment shown in FIG. 4 in that the boundary between L 8 and L 9 is further centered in the base line length direction.
The width increases as it goes to the periphery.
【００２８】[0028]
【発明の効果】本発明によれば、複数の受光エリアを持
つ受光センサーにおいて、中心部分よりも周辺部分の受
光エリアを大きくするという構成をとることによって、
合致調整による位置ズレにともなうリニアリティの劣化
を防止すると共に、左右の測距能力が著しく低下させる
ことなく、安定した受光センサーユニットを供給するこ
とが出来る。According to the present invention, in a light-receiving sensor having a plurality of light-receiving areas, by adopting a configuration in which the light-receiving area in the peripheral portion is made larger than in the central portion,
It is possible to prevent the linearity from being degraded due to the positional deviation due to the matching adjustment, and to supply a stable light receiving sensor unit without significantly reducing the left and right distance measuring capabilities.
【図１】本発明による測距用受光センサーの第１実施例
を示す図。FIG. 1 is a diagram showing a first embodiment of a light receiving sensor for distance measurement according to the present invention.
【図２】図１における各受光センサーの測距エリアを示
す図。FIG. 2 is a diagram showing a distance measurement area of each light receiving sensor in FIG. 1;
【図３】本発明による測距用受光センサーの第２実施例
を示す図。FIG. 3 is a diagram showing a second embodiment of a light receiving sensor for distance measurement according to the present invention.
【図４】本発明による測距用受光センサーの第３実施例
を示す図。FIG. 4 is a diagram showing a third embodiment of the light receiving sensor for distance measurement according to the present invention.
【図５】図４に示す測距エリアとファインダーとの関係
を示す図。FIG. 5 is a diagram showing a relationship between a distance measurement area and a finder shown in FIG. 4;
【図６】本発明による測距用受光センサーの第４実施例
を示す図。FIG. 6 is a diagram showing a fourth embodiment of the light receiving sensor for distance measurement according to the present invention.
【図７】投光手段であるＩＲＥＤのパッケージの一例を
示す図。FIG. 7 is a diagram showing an example of a package of an IRED as a light projecting unit.
【図８】図７のＩＲＥＤの投光図。FIG. 8 is a projection view of the IRED of FIG. 7;
【図９】従来の受光センサーを示す図。FIG. 9 is a diagram showing a conventional light receiving sensor.
【図１０】従来の広視野受光センサーを示す図。FIG. 10 is a diagram showing a conventional wide-field light receiving sensor.
Ｌ1 〜Ｌ13…測距範囲の夫々のエリアを担当する受光セ
ンサーL 1 ~L 13 ... the light-receiving sensors in charge of the area of each of the distance measurement range
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−143612（ＪＰ，Ａ) 特開 平１−100415（ＪＰ，Ａ) 特開 昭57−190209（ＪＰ，Ａ) 実開 平３−88109（ＪＰ，Ｕ) 特表 平２−504441（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G01C 3/00 - 3/32 G01B 11/00 - 11/30 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-143612 (JP, A) JP-A-1-100415 (JP, A) JP-A-57-190209 (JP, A) 88109 (JP, U) Table 2 504441 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G01C 3/00-3/32 G01B 11/00-11/30
Claims (1)
応じて設けられた複数の受光エリアを有する受光センサ
ーに結像し、測距情報を得る測距用受光センサーにおい
て、周辺のセンサーをそれよりも中心側のセンサーに対
して受光面積を大きくしたことを特徴とする測距用受光
センサー。1. A ranging light-receiving sensor that forms reflected light from a distance-measuring target object on a light-receiving sensor having a plurality of light-receiving areas provided according to a measurement distance and obtains distance-measuring information. A light-receiving sensor for distance measurement, characterized in that the sensor has a larger light-receiving area than the sensor on the center side.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4005639A JP2914807B2 (en) | 1992-01-16 | 1992-01-16 | Light receiving sensor for distance measurement |
| US08/277,135 US5457525A (en) | 1992-01-16 | 1994-07-19 | Distance measuring device having light receiving areas of different sizes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4005639A JP2914807B2 (en) | 1992-01-16 | 1992-01-16 | Light receiving sensor for distance measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05187872A JPH05187872A (en) | 1993-07-27 |
| JP2914807B2 true JP2914807B2 (en) | 1999-07-05 |
Family
ID=11616712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4005639A Expired - Fee Related JP2914807B2 (en) | 1992-01-16 | 1992-01-16 | Light receiving sensor for distance measurement |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5457525A (en) |
| JP (1) | JP2914807B2 (en) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6118521A (en) * | 1996-01-02 | 2000-09-12 | Lj Laboratories, L.L.C. | Apparatus and method for measuring optical characteristics of an object |
| US5966205A (en) | 1997-07-01 | 1999-10-12 | Lj Laboratories, Llc | Method and apparatus for detecting and preventing counterfeiting |
| US5759030A (en) | 1996-01-02 | 1998-06-02 | Lj Laboratories, L.L.C. | Method for determing optical characteristics of teeth |
| US6307629B1 (en) | 1997-08-12 | 2001-10-23 | Lj Laboratories, L.L.C. | Apparatus and method for measuring optical characteristics of an object |
| US6254385B1 (en) | 1997-01-02 | 2001-07-03 | Lj Laboratories, Llc | Apparatus and method for measuring optical characteristics of teeth |
| US5926262A (en) * | 1997-07-01 | 1999-07-20 | Lj Laboratories, L.L.C. | Apparatus and method for measuring optical characteristics of an object |
| US6373573B1 (en) | 2000-03-13 | 2002-04-16 | Lj Laboratories L.L.C. | Apparatus for measuring optical characteristics of a substrate and pigments applied thereto |
| US5880826A (en) | 1997-07-01 | 1999-03-09 | L J Laboratories, L.L.C. | Apparatus and method for measuring optical characteristics of teeth |
| US5745229A (en) * | 1996-01-02 | 1998-04-28 | Lj Laboratories, L.L.C. | Apparatus for determining optical characteristics of an object |
| US6239868B1 (en) | 1996-01-02 | 2001-05-29 | Lj Laboratories, L.L.C. | Apparatus and method for measuring optical characteristics of an object |
| US6233047B1 (en) | 1997-01-02 | 2001-05-15 | Lj Laboratories, L.L.C. | Apparatus and method for measuring optical characteristics of an object |
| US6301004B1 (en) | 2000-05-31 | 2001-10-09 | Lj Laboratories, L.L.C. | Apparatus and method for measuring optical characteristics of an object |
| US6870616B2 (en) | 1998-06-30 | 2005-03-22 | Jjl Technologies Llc | Spectrometer apparatus for determining an optical characteristic of an object or material having one or more sensors for determining a physical position or non-color property |
| US6501542B2 (en) | 1998-06-30 | 2002-12-31 | Lj Laboratories, Llc | Apparatus and method for measuring optical characteristics of an object |
| US6449041B1 (en) | 1997-07-01 | 2002-09-10 | Lj Laboratories, Llc | Apparatus and method for measuring optical characteristics of an object |
| US6271913B1 (en) | 1997-07-01 | 2001-08-07 | Lj Laboratories, Llc | Apparatus and method for measuring optical characteristics of an object |
| US6246479B1 (en) | 1998-06-08 | 2001-06-12 | Lj Laboratories, L.L.C. | Integrated spectrometer assembly and methods |
| US6246471B1 (en) | 1998-06-08 | 2001-06-12 | Lj Laboratories, Llc | Apparatus and method for measuring optical characteristics of an object |
| US6573984B2 (en) | 1998-06-30 | 2003-06-03 | Lj Laboratories Llc | Apparatus and method for measuring optical characteristics of teeth |
| US6249348B1 (en) | 1998-11-23 | 2001-06-19 | Lj Laboratories, L.L.C. | Integrated spectrometer assembly and methods |
| US6538726B2 (en) | 1998-07-10 | 2003-03-25 | Lj Laboratories, Llc | Apparatus and method for measuring optical characteristics of an object |
| US6362888B1 (en) | 1999-12-23 | 2002-03-26 | Lj Laboratories, L.L.C. | Spectrometer assembly |
| US6519037B2 (en) | 1999-12-23 | 2003-02-11 | Lj Laboratories, Llc | Spectrometer having optical unit including a randomized fiber optic implement |
| US6414750B2 (en) | 2000-01-10 | 2002-07-02 | Lj Laboratories, L.L.C. | Spectrometric apparatus and method for measuring optical characteristics of an object |
| US6903813B2 (en) | 2002-02-21 | 2005-06-07 | Jjl Technologies Llc | Miniaturized system and method for measuring optical characteristics |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5670515A (en) * | 1979-11-14 | 1981-06-12 | Minolta Camera Co Ltd | Distance display unit of camera with automatic focusing regulator |
| JPS57148708A (en) * | 1981-03-10 | 1982-09-14 | Canon Inc | Zone detector |
| JPS62212512A (en) * | 1986-03-14 | 1987-09-18 | Olympus Optical Co Ltd | Apparatus for detecting range information on object |
| US5191384A (en) * | 1988-01-30 | 1993-03-02 | Minolta Camera Kabushiki Kaisha | Distance measuring system |
-
1992
- 1992-01-16 JP JP4005639A patent/JP2914807B2/en not_active Expired - Fee Related
-
1994
- 1994-07-19 US US08/277,135 patent/US5457525A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5457525A (en) | 1995-10-10 |
| JPH05187872A (en) | 1993-07-27 |
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| Date | Code | Title | Description |
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| LAPS | Cancellation because of no payment of annual fees |